Process for bendering sterilized water tasteless and odorless.



UNITED STATES PATENT OFFICE.

REINHOLD satires, or crraanorrnnnuae, GERMANY, sssro voa Toreagenranmxnn vonia. rarnnn. BAYER a 09., or uupnaFELD, enamaur, A0013.201

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Specification of Letters Patent. Patefltgd Nov, 18, 1913. Applicationfiled February 10, 1913. Serial No. 757,520.

To all whom it may concern:

Be it known that I, REmHoLn GRiiTEn, doctor of philosophy, chemist,citizen of the German Empire, residing at- Charlottenbur Germany, haveinvented new and useful Improvements in Processes for RenderingSterilized ater Tasteless and Odorless, of which the following is aspecification.

It is known that drinkable water can be sterilized and freed fromvarious kinds of bacteria'by means of halogen or of salts ofhypohalogenous acids. It has-however been found that the quantity ofdisinfecting agents M formerly used for this purpose is much too smallto destroy for instance typhus bacilli and it is therefore necessary touse for the sterilization the agents before mentioned in considerablylarger quantities. To render the water which has been sterilized in thisway, odorless and capable of being used the halogen or the salts ofhypohalogenous acids were removed from'the water by suitable means orrendered innocuous and tasteless. Th'process used hitherto for thispurpose suffers from certain disadvantages which already have beenpointed out by Ballner and Engels (Archie fair Hygiene, vol. 48, pages140-178). I

It has now been found that water sterilized with halogen or with saltsof hypohalogeno s acid can be rendered suitable for use andwltll thesedisadvantages avoided, if the sterilized water is subjected to anaftertreatment with hydrogen peroxid or its. derivatives such asperoxids or persalts. Even if considerable uantities of hypochlorite oflime (bleac ing powder) have been used'for the sterilization the odor ofthe.hypochlorite of lime disappears completely within a short time afterthe addition of the before mentioned peroxid compounds; the'tastelikewise does not recall in any way the disinfecting agent which hadbeen used; furthermore the water so treated has no alkaline or saltytaste, whichwould render the'drinking of the water objectionable; on thecontrary the taste of the water is pleasant and refreshing.- The latteris even. the case if polluted water had been treated which originallyhad a bad taste or odor. Although it has been known that salts ofhypohalogenous acid react on hydrogen peroxid with evolution of oxygen,the above mentioned efiect, that sterilized water could be rendereddrinkable in such a perfect way, could not have been foreseen.

In order to illustrate the new process more fully the following exampleis given,

the parts being by weight :-0.-25 to 0.3

parts of sodium perborate are well mixed with 1000 parts of watersterilized by treatment with an aqueous paste of 0.3'parts of bleachingpowder containing per cent. of

active Cl while the water 1s being stirred.

Instead of sodium perborate equivalent quantities of hydrogen peroxid,calcium peroxid, sodium peroxid or other eroxids or persalt-s may beused. After a ew minutes the calcium salts which separate can befiltered oif. I

It is remarkable that whenusing perborates which arethe most convenientform of per compounds, the, boric acid is almost completely precipitatedwhich' is of great' I advantage.

' I claim:

1. Process of by treatment with a halogen, tasteless and odorless, whichprocess consists in treating.

water sterilized in this manner with a peroxid compound which liberatesoxygen in the presence of water, substantially as described.

2. Process of rendering water, sterilized by treatment with a salt of ahypohalo enous acid, tasteless and odorless. whic process consists intreating water sterilized in this manner with, a peroxid compoundwhichliberates oxygen in the water, substantially as describe 3. Process ofrendering water, sterilized by treatment with a halogen, tasteless andodorless, which process consists in treating water sterilized in thismanner with h drogen peroxid, substantially as describe 4. Process ofrendering water, by treatment with a salt of hypohalogenous acid,tasteless and odorless, which process consists in treating watersterilized in this manner with hydrogen peroxid, substandpresence oftially as described.

5. Process of rendering water, sterilized by treatment with a halogen,tasteless and odorless, which process consists in treating watersterilized in this manner with a peroxid which liberates oxygen in thepresence of water, substantially as described.

rendering water, sterilized 9 5 sterilized 6. Process of renderingwater, sterilized by treatment with a salt of hypohalogenous acid,tasteless and odorless, which rocess consists in treating watersterilized 1n this manner with a peroxid which liberates oxygen in thepresence of water, substantially as described.

7. Process of rendering water, sterilized by treatment with a halogen,tasteless and odorless, which process consists in treating watersterilized in this manner with a percompound which liberates oxygen inthe presence ofwater, substantially as described.

8. Process of rendering water, sterilized by treatment vwith a salt ofhypohalogenous acid, tasteless and odorless, which process consists intreating water sterilized in this manner with a percompound whichliberates oxygen in the presence of water, substantially as described.

9. Process of rendering water, sterilized by treatment with. chlorin,tasteless and odorless, which process consists in treating watersterilized in this manner with a per- OXlCl compound which liberatesoxygen in the presence of water, substantially as described.

10. Process of rendering water, sterilized by treatment withhypochlorite of lime, tasteless and odorless, which process consists intreating water sterilized in this manner with a peroxid compound whichliberates oxygen in the presence of water, substantially as described.

- In testimony whereof I have hereunto set my hand in the presence oftwo subscribing witnesses.

REINHOLD GRUTER. Witnesses HENRY HAsrER, 'WQLDEMAR HAUPT.

